Method of cutting die-roll matrices



Nov. 30 1926.

w. P. WITHEROW METHOD OF CUTTING DIE ROLL MATRICES s sheets-sheet v2 Filed Oct. 6, 1925 lNVENTOR Willi@ v. WMM

WILLIAM r; wrrn'naow, or rITrsBUI'teH,

mofa' .ar-,ar orsi-ca;

'sYLvaNIm October` This invention'relates 4to a method of cnt# ting die roll matrices, and -articularly to the4 method. ofcutting diero ls for the production of die rolled articles of circularcross 5 section.\ t 'The invention islof Value not only vin the manufacture of new rolls, butis also valuable in' the redressing ofpolcl die rblls, as dev scribedand claimed in the 'copending aplo (pllication of Paul L. Coyle, Serial,No 6Q,757,

'led October 6,1925., r.

'In the die rolling ofarticles 'of Avarying circular cross section, someA difficulty is encounteredv in laying out the rolls and in properly cutting the matrix 'portion due to the fact -thatl the bottom of the ooveis of. la different length vthan the -sur ace portion of the oove, and the bottom of the matrix, therefore, takes -ashape which sometimes I 20 differs surprisingly from'the-outline which Q i might be expected. It is not only diicult to lay out such roll contour, accurately, but it is also diflicult to cutthe same by ordinary means. I- provide for cuttingthe matrix 23- portion of die frolla by rotating'a cutter about an axis, occup 'ng the-same relation tothe roll blank as t e axis of a bar in the rolling millfwill occupy with respect tothe {inished roll andjrotating the blank under the cutteln?A A roll for forming articles of varying circu-l lar .cross section, the'rdial length of the cut.-

when it is desired to produce a ter from its axis ofrotation is varied as dei sired. 'I

on, and lby tl'ie method of'cuttin'g herein dis'- closedthe recutting of the grooves is mate- 40 rially simplified.

The cutter preferably occupies a' with respect'to the blank cbr'respondingto a point lying Jon the centerline connectingr the axes ofthe two' rolls inf the mill,fa'point which is hereinafter designated' as the prncipal point of Contact, I have found that ,by using suchv a cutter in the production of a die roll, the formation ofthe matrix is materially simplified, as 'theioutline of they matrix may be-marked or lai/d out on the periphery of the roll and it is a relatively simple matter for a mechanic to follow-this outline-With the cutting tool. The rotating tool automatically takes careof the body In redreesing rolls it is practically sible because of the battered conditioner the roll periphery',tolay out-the grooves there'- or our'rmonmaoLL-marirons. v l.

Y .I v t .l The radial adlustment of the cutter, which 1s necessary in t such articles as taperedl drive .shafts and PENNSYLVANIA, AssIGNon 'ro yvmnmow e. formation of a matrix for other shapes having a v,a r'y`1i'n,.@ .,fcircular'cross sect1on,' '1s preferably accomplished by tapping the tool lightly with a hammer.- With a little experience'this'can be done Vvery ac- 'curatelyand the groove-,cut to desired dimensions. t. A e

Thef'method can be well carried out on an ordinary .milling machine, the cutter being mounted on an arbor and the roll'fblanlr being mounted between ce/nters on the milling machine table' means by vwhich the operator is the tool by whic the radial length ofthe cutter is varied may; be done by usin a hammer on .the heel of the cutting too or on the rear end of the tool if it projects u i' l y through the arbor. l

I have found that highly -improvedresults may 'be secured 4if an increasing 're-' sistance to displacementfof the cutter on tapingthereof is provided. This is preferably one [by very slightly tapering the body of 'the tool; It-will be understood that the tool isheld in the arborby a set screw and it will be seen'that if the tool is very slightly tavthe tapping of the cutter will be met :with anv increased resistance asthetool is displaced; Thisfeature also prevents the cutter being tapped so farinto the arbor-that the rear end the Work.- l vThe process is preferably carried out by laying out on the smooth roll Abody the-contour of the'pmatr-ix to be cut and then rough? ing out, as by lathe cutting,an initial groove corresponding to the smallest cross section..

ferred manner of carrying out myl invention- .i Figure l is a side elevationof a blank to be produced by die rolling;

Figure 2 is a vertical section projects far enough to dig into illustrate more or less in diagram, a pre.

A a dividing head or other the blank can be rotated by rovided: The tapping of through a less iagrammatic, illustrating the preferred manner'of carrying outmy invention.

vIn the illustrated embodiment of the Xin`l vention there isshown, for purposes of il.

lustration only, an automotive rear axle which 1s a fair example of a varying l-circular cross section which may be produced by die rolling.

- rolling mill4 proper.' This cutter may -be' Referring to Figure l, it will be noted that there is a stub portion A, a long tapered body portion B and an end portion C which has a taper in the opposite direction.

Figure 2 shows a layout of a roll matrix' for producing theI article shown in Figure 1`, and indicates ,in dotted line the position of the leader as it enters the mill and the vstring of die-rolled articles as they emerge therefrom. It -willzbe seen that lthe root portion'of the matrix follows a line which would be decidedly difficult to cutQby ordinary machine methods.- In accordance with my invention .a cutting tool is placed'on a line of rotation corresponding tothe axis X.-X of the leader and rolled bar in the mounted on the arbor of a milling machine' and its'radial length will, of: course besuchl as to -cut a matrix of the ldesired diameter.

.The cutter is preferably mounted on the arbor in such position that it lies in a line corresponding to the line -YY of Figure 2,

which is the center line connecting the axes vof the two lrolls in the mill. The cutting action will then take place at a point corresponding to the ointfC -in Figure 2 which I .have designated) the .principal 'point of contact. .y It will be appreciated that with a cutterso mounted it is only necessary to v ary-l the radiallength r of the cutter in order to ac curately produce afroll matrix'which'will be effective for rolling the desired-article. By Amy method the bottom of the groove is properly shaped in accordance with the contour of the article as-laid out on the periphery' of the roll and very accurate-resultsare' obtained. Referring to Figure 3, thereis shown a developed periphery of the roll blank with ,the outline of .the matrix', marked thereon. This is carried out in the lusual way by copper plating the surface with bluevitriol and product of then marking thereon the cbntourof thelroll matrix as shown.4v

As described in my c'opending4 application,V

Serial No. 44,455, filed July 18, 1925,`it'is generally desirable eto form a number of groosves in a'single'roll,Y so that after one pass has been worn out the next pass is immediately utilized and thefrolling operation is continued. Onlyq'a portion of v'the roll is shown in Figure 3 and a. 'single'pass is marked out.A vIt will beunder'stood that in z the l'actual' roll 4.the additional passes are marked out toeorrespond. This is preferably donebyA lirstscoring lines L across the periphery f of'the roll so that all -of the various grooves will correspond. These lines arepreferabl 4deeply impressed upon the surface and tieyf form indicia on the flash by which the length of the rolled articles ,may be conveniently measured. It twill be noted that' the axlebla'nks-are formed 'with a short gate portion G' which may be ncroac'hed-upon in redressing'as described in the aforementioned Coyle application.

4Figure. 4 shows the-developed ioll after the initial .groove has 'been' '.cut therein.-

This is preferably done on a lathev and it only remains to 4cut out the portions orfmetal lying between the 'solid linesliowing thel edge of the vini'tial groove andthe-fdotte'd line indicating the final contour fof the 'matrixa J5 4Figure 5 is similar to Figure 4 but it shows the groovepartially cut -to finished size according to 'my method. l

Figure 6.. clearly shows the manner in which my method is applied to fJhe cutting 'of a roll matrix. -I'Ihe blank 2 is, mounted on anarbor 3 which isfsupported between.

centers on the table of a mllling machine',

head 5 of the'milling' machine and the 'arbor is provided withan opening-in which.. is

,placed a' cutter 6. The c'utter -6 is heldin' place bya setfscre'w 7. UA dividin vhead or other spacing mechanism 8 is provi being a hand'wheel 9 by .whichthe operator may rotate thef arbor 3 with the-blank 2 thereon'asdesired. v

It will be noted in Figure 6 that the cutthe axisof the, arbor 3 and roll 2 Aso that the cutting ac'tioufoccurs at a p ointJ corres onding to the princi-pal 'pointof contact (i) inthe mill. ,'I haveJ indicated this in "the Fdrawings as C.

will lbecut which corresponds exactly to. the article to be produced. In the upper right hand portion of the drawingsthere is indicalt# ed, there n f ouows hai; iffhara-dia1-1engfh of that tool is correct, :L -groove A or matrix portion '105 I not shown. arbor4 is placed `in they 'ter 6 lies in a vertical -line extending from edthe initial groove 10 which vi`sf fc1 1t on'the 'lathe and .by dotted line at,11 there -is indi;l

cated '.-the lfinal contour of the, matrix porftion. It will'be notedtha-t the groove por#v p tion which is to be cut beyond the initial -groove already cut is grMadually-increased in diameter. as is' shown by the divergence of the'line 11 from initial groove 10. The radial l'length of the cutter 6 must therefore be increased as the roll 2l is rotated thereunder in order tdproduce the desired Groove.

The radial' length ofthe cutter isvery readily increased by tapping the tool at the back end with a hammer. This can be done by the workman as the cutter rotates, and after he taps the tool he operatesV the handA wheel 9 so as to advance the work under the cutter. Vith a little experience, a competentworkman can soon produce very accurate tapered grooves, or grooves of other shapes in this manner. 1

The tool is preferably tapered slightly with respect tothe face against which the set screwL7 bears. This prevents' the toolr from suddenly loosening and moving too far.

the point marked 12, which is the heel of 'the cutting end ofthe tool,'is tapped instead ofI the back end. In this case,1ofr course, the tool shouldbe tapered lslightly in the oppositedirection.

When a` roll is being redressed, it islir'st turned down and-this, of course, removes the lines L from `the peripheryof they roll. As a guide to t-he roll cutter in redressing,

.there 1s preferably provided a markltf'on one end ofthe roll which the Aworkman-may use as a starting point if he desires to'lay out cross lines L on the roll after it has' been turned down slightly. These marks or lines on theperiphery- -are' practically the only guides which are used when a roll`` is redressed according to my method because, as-above stated, it is impossible" to accurately lay .out thecontours of the grooves in the manner shownL in Figure 3. 'Instead of this the workman adjusts the radial length'of.

the cutting tool 6 to remove what appears to him to be a requisite amount of metal,

and then by using templates at the lines L or at intermediate lines temporarily marked on the periphery ofA the roll forconvenienc'e, g

he can quickly arrive at the propern'cross sectional dimensions for the recut groove.

""An important' advantage of my invention resides' in the fact that compensation 'can be made for spring. of the mill and the mill rolls during the cutting of the roll matrix.

of spring in the roll.

When a section of small diameter is being rolled the reduction. is greater than if a.

larger lsection is being rolled from'the same j leader and there is a changein the amount tain points,v and as a result of this the spring .ofthe mill is compensated for' andtruly -circularsections are produced.

, 4Vifhile I have illustrated one manner .of carrying out my invention, it willbe understood that the invention is not so limited as it=may be otherwise embodied or practiced within the scopeof the following claims articles .of varying circular cross section,

Whichlinclud'es rotating a cutter abQutan axis Voccupying substantially the "same lrela-'- tion to the roll blank as the axis,of'a bar,

in the mill will occupy with respect to the Afinished roll, the cutter being capable `ofllateral Vmovement with respect to its axis ofL rotation, causing relative rotation of'the blank with respect to the axis of the cutter,

and varying the radial le 'th of the cutter by tapping the cutting too 2. The method of' making die rolls for ari .ticles of varying circular cross section, which includes rotatlng a cutter about anaxis occupying substantially the .same relation to the roll blank as the axis of a bar in the mill with respect to its axis of rotation, causing ing=substantially the saine relation to the roll blank as the axis of' a bar. in .the lmill will occupy'with respect to the finished roll, causingrelat-ive rotation of the blank and .the cutterv axis to bring successive portions.

of the roll' blank into' cutting relation with the tool,r` and varying the radial length 'of the cutter in accordance ,with the profile marked on the periphery of the roll vhile maintaining'the cutter in substantially the Vthe mill will occupy with respect to the finisheclroll, maintaining the cutter in substantially the same axial position,- but varying vitsradial length in` accorda-nce with the size of thc roll matrix portion which it is desired to cut, and rotatingtheblank rela-v* tive to the axis of the cutter.

5. The method of making die rolls for ar'- ticles of varying circular cross section, which includes rotating they cutter about an axis occupying Substantially the same relation to the rolled blank as the axis of the barin the mill will -occupy with respect. to the fin ished roll,\conning,the cuttingaiction tofpoints substantially within aplane perpendicular to the cutting axis and intersecting the axisof the roll,'varying the radial length of the cutterain accordance with the size ofv (i. The methodl otl making die rolls for ar-.

ticles of'varying circular cross section, which includes rotating a cutter about an axis occupying substantially 'the same relation toA the roll blank as the axis of a bar in the mill lwill occupy with respect to the finished roll, the cutter being capable of lateral movement. witlrrespect to its axis of rotation, causing relative rotation of the blank With respect'to the axis .of the cutter, Varying the radial 4length of the cutter by shifting it laterally7 so as to cut matrix portions of different size'4 in the roll blank` and shifting the cutter axis tow'ardand' away from the axis o'f the 'blank in accordance .with the size of the mati'i'xbeing cut so as to compensate for varying spring, of the rolls or the mill when WrLLIa-'M P. WITHEROW. 

